Chad, yes. 99% sure they do.
Oops, edit: I read your post ad "pumps" not plugs.... I am actually not sure if they have a drain plug....
As I recall, the only thru hull stuff below the waterline is/are the boots at the roots of the MLG legs. Just my recollection.
It could have been a failure there or hull damage.
Looking forward learning more. An A5 is not in my near future, but might be in the distant.
